Abrading device



Nov. 19, 1929. W. STI-:VER 1,736,098

ABRADING DEVI CE Filed June 25, 1927 I ni , 5,/ ill l lIIlI Patented Nov'.V 19, 1929" I UNITED sTATEs PATENT OFFICE WILLIAM STEVER, OF BERLIN, GERMANY, ASSIGNOR TO BEHR-MANNING CORPORA- TION, OF TROY, NEW YORK, A CORPORATION OF NEW YORK ABRADING DEVICE y Application filed June 25,

The present invention relates to'abrading devlces and more particularly devices `for att-aching an abrading or sanding disc to a roy tatable carrier head.

An object of the invention is to provide an attaching means for the abrading disc which is readily operable without the use of tools for clamping the disc to the rotating head.

A further object of the invention is to provide an attaching means which may be manufactured at an inconsiderable cost and readily applied to the usual type of head.

The above and other objects of the invention of a generally similar nature will become clearer as the description proceeds in connection with a preferred embodiment shown in the accompanying drawing, wherein Figure 1 is an edge view of a rotatable head showing the disc applied thereto.

Figure 2 is a sectional view taken through the head showing the attaching devices in operative position.

Figure 3 is a v'iew similar to Fig. 2 taken at a slightly different angle showing the position of the movable parts of the attaching device before the disc is secured in osition.

ub portion Figure 4 is a face view of the disc. Figure 5 is a perspective showing the movable part of the attaching device.

Figure 6 isa sectional view on substanu tially the line 6 6i of Fig. 4 showing the relative positions of the' disc and clamping element.

Figure 7 is a face view of the disc.

Referring to thedrawings, 10 indicates the drive shaft of any suitable mechanism having a housing 10 (Fig. 1), the shaft having a threaded end 10 reduced to t within the) hollow hub portion 11 of a head having a peripheral portion 12 secured to a backing plate 13 by means of rivets 14. The marginal portion 12 of the head is, in the present instance, of relatively flexible material, such as felt, and the backing 13 is of relatively stiffer material, which does not extend to the edge of the peripheral portion so as to permit the latter to yield or ex adjacent its edge. Heads of this ty e are old and well known in the art, and are s own, for example, in the patent to closed end 23.

1927. Serial No. 201,506.

Stratford, 1,558,714, granted December 15, 1924. It will be understood that the present invention is not limited to use with this particular type of kyielding head, and is simply shown as associated therewith for purposes of illustration. A

The backing 13 of the head is formed of a plurality of layers or plies 13', 13, all of latter having thereon a circumferential cam groove 20, which receives a follower pin 21 lixedly positioned on a collar 22 having a The collar is provided with a pair of wings 24, 25, each wing having an upwardly deflected terminal portion 26, the edges 27, 28 of which are disposed on opposite sides of `'the head axis and of the hub 22.

As will be observed, the wing edges 27 28 and their adjacent raised portion's26 extend l outwardly a suliicient distanceto overlie the outwardly and upwardly inclined top surface 29 of the plate 16 (Fig. 3) and the wings are inclined so that upon rotation of the collar 22, they will be moved downwardly toward the face 29 to depress the central portions of a sanding disc whichr they overlie, as illusf trated in Fig. 6.

The. attachment device is maintained to be employed with a sanding disc 9 as is shown in Fig. 7 having a centrally disposed opening 30 with radially disposed slits 31 leading therefrom and disposed on opposite sides of openings 30. When the disc is to be applied to the head, edges of the slits 31 on opposite sides of a line extending through both slits are depressed slightly and thenthe disc is 4 placed upon the head so that the closed end 23 of the collar will project through the opening 30, the collar thus serving as a centering ub for the disc. Pressure upon the` 32, 33 of the rotation will tend to force the upon association of the wings with a opposite edges of the slits, such as the edge 32 and the edge 33 will lower them suflciently to bring them to a plane below the raised ends 27, 28 of rotated relative to the wings and centering collar 22 to carry the edges 32, 33 respectively beneath the raised wing edges 27, 28. vIf necessary, the hub collar 22 and wings may be held against rotation with the disc by inserting a suitable tool such as a Spanner lwrench within the sockets 35 in the closed end 23 of the hub. When the disc has been rotated suiciently so that the raised terminal portions 2 6 of the wings 24, 25 overlie the edges 32, 33 of the disc slits the central hub portion will then turn with the disc (providing it is released if it has been held against rotation as described) and the follower pin 21 working in the cam slot 20 will draw the hub collar inwardly to depress those edges disc slits underlying the wing portions 26. This depressing engagement will be continued since the clamping device is so arranged upon the head that the latter will' rotate in a counter-clockwise direction, as illustrated by the arrow 36 in Fig. 4, and pressure upon the sanding'dis'c due to this attaching device in the opposite or clockwise direction.

When it is desired to renew the sanding disc it is simply necessary to rotate the same in the direction of the arrow 36, or if desired, the collar 22 may irst be rotated by engaging a tool with the sockets 35 to raise the wings toward the plane of the supporting disc supporting surface ofthe head marginal portion.

Obviously, the construction may be modiiie'd considerably without departing from the invention, which is defined in the .following claims: l v

I claim l 1. A device of the class described comprising a rotatable head having a substantially kiiat surface adapted to support a sanding disc, and a centrally disposed attaching device comprisinga projectin centering hub portion and wings having ree edges disposed on substantially opposite sides of said hub and arranged substantially radially with respect thereto, said wings being arranged on substantially oppositel sides of said hub, and .being movable toward and from the plane of said disc supporting surface, whereby to be lowered relative to said supporting surace isc,

' said hub being adapted to fit within a'central opening of a sanding disc and the edges of said wings being adapted to project into openings in the disc arranged on opposite sides o said central opening.

2. A device of the class descrlbed comprisrm. adams mm1 having a substantially the wings 24. The disc may then be vice comprising a projecting centering hub portion and Vwings having free edges disposed on substantially opposite sides of said hub and arranged substantially radially with respect thereto, said wings being arranged on substantially opposite sides of said hub, and being movable toward and from the plane of said disc supporting surface upon rotation of said hub, whereby to be lowered relative to said supporting surface upon association of the wings with a disc, said hub being adapted to fit within a central opening of a san disc and the edges of said wings being adapted to project into openings in the disc arranged on opposite sides of said central opening, and means for raising and lowering said hub and wings when the hub is rotated.

3. A device of lthe class described comprising a rotatable head having a substantially flat surface adapted to support a sanding disc, and a centrally disposed attaching device comprising a projectin centering hub portion and wings having substantially opposite sides of said hub and arranged substantially radially with respect thereto, said wings being arranged on substantially opposite sides of said hub, and beree edges disposed on l ing movable toward and from the plane of y said disc supporting surface upon rotation of said hub, whereby to be lowered relative to saidv supporting surface upon association of the wings with a disc,

said hub being adaptedl to fit within a central opening of a sanding l means on said hub and head.

4. A device of the class descrlbed comprising a rotatable head having a, substantially flat surface adapted to support 'a sanding disc, and a centrally disposed attaching device comprising a' projecting centering hub pOrtion and`wings having free edges disposed'on substantially opposite sides of said hub and arranged substantially radially with arranged respect thereto, said wings being arran ed on substantially opposite sides of said hu and being movable toward and from the plane of said disc supporting surface upon rotation 0f said hub, whereby to be lowered relative to said supportlng surface upon association of the win with a disc, said hub being ada .ted

to fit wlthin a central opening of a san lng disc andthe edges of said wings being adapt-ied to roject into openings in the disc arrange on opposite sides of said central open-y ing, the wings being engageable and rotatable by rotation of a sanding disc when the latter receives said wings, and means for raising and Vlowering saidwlngps and hub upon said ing a rotatable head having a substantially flat surface adapted to support a sanding disc, and a centrally disposed attaching device comprising an outwardly projecting centering hub portion and Wings having free 'edges disposed on substantially opposite sides of said hub and arranged substantially radially with respect thereto, said Wings being arranged on substantially opposite sides of said hub, and being movable toward and from the plane of said disc supporting surface upon r0- tation of said hub, whereby to rbe lowered relative to said supporting surface upon association ofthe Wings with a disc, said hub being adapted to fit Within a cent-ral opening of a sanding dise and the edges of said Wings being adapted to project into openings in the dise arranged on opposite sides of saidV central opening, and means for raising and lowering said Wings upon said head as the Wings are rotated, said Wings being rotatable by a sanding disc when the latter is associated with l the Wings, said raising and lowerlngmeans comprising follower means associated respec- Y tively with said hub and wlngs, and a cam WILLIAM STEVER.

my hand. 

